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Loans, net and allowance for loan losses - Information Concerning Nonaccrual Loans by Major Loan Classification (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 3,974 $ 8,117
Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 648 3,822
Real estate Commercial    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 2,435 3,262
Real estate Residential    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total 809 922
Consumer    
Financing Receivable, Recorded Investment, Past Due    
Nonaccrual loans, Total $ 82 $ 111